Android program Shape use summary!

In Android program development, we often use Shape to define various shapes.

First, let’s understand what labels are under Shape and what they mean:

solid: fill android:color specifies the color of the fill

gradient: gradient android:startColor and android:endColor are the starting and ending colors respectively.

android:angle is the gradient angle, which must be an integer multiple of 45. In addition, the default mode of the gradient is android:type="linear", that is, a linear gradient.

The gradient can be specified as a radial gradient, android:type="radial", and the radial gradient needs to specify a radius android:gradientRadius="50".

The position corresponding to the angle value is shown in the figure:

stroke: stroke android:width="2dp" the width of the stroke, android:color the color of the stroke. We can also make the stroke into a dotted line. The setting method is: android:dashWidth="5dp" android:dashGap="3dp" where android:dashWidth represents the width of a horizontal line like '-', android:dashGap represents it distance apart

corners: rounded corners android:radius is the radian of the corner, the larger the value, the rounder the corner. We can also set the four corners to different angles,

If five attributes are set at the same time, the Radius attribute is invalid

android:Radius="20dp" Set the radius of the four corners

android:topLeftRadius="20dp" Set the radius of the upper left corner android:topRightRadius="20dp" Set the radius of the upper right corner android:bottomLeftRadius="20dp" Set the radius of the lower right corner android:bottomRightRadius="20dp" Set the radius of the lower left corner

padding: The interval can be set in the four directions of up, down, left, and right

Here we look at a simple example, ShapDemo, first define two xml files under the drawable folder:

The content of button_bg.xml is as follows:

<?xml version="1.0" encoding="utf-8"?>

<!-- 填充 -->
<solid android:color="#ff9d77" /> <!-- 定义填充的颜色值 -->

<!-- 描边 -->
<stroke
    android:width="2dp" 
    android:color="#fad3cf" /> <!-- 定义描边的宽度和描边的颜色值 -->

<!-- 圆角 -->
<corners
    android:bottomLeftRadius="5dp"
    android:bottomRightRadius="5dp"
    android:topLeftRadius="5dp"
    android:topRightRadius="5dp" /> <!-- 设置四个角的半径 -->

<!-- 间隔 -->
<padding
    android:bottom="10dp"
    android:left="10dp"
    android:right="10dp"
    android:top="10dp" /> <!-- 设置各个方向的间隔 -->

The content of button_pressed_bg.xml is as follows:

<?xml version="1.0" encoding="utf-8"?>

<!-- 渐变 -->
<gradient
    android:endColor="#FFFFFF"
    android:gradientRadius="50"
    android:startColor="#ff8c00"
    android:type="radial" />

<!-- 描边 -->
<stroke
    android:dashGap="3dp"
    android:dashWidth="5dp"
    android:width="2dp"
    android:color="#dcdcdc" />

<!-- 圆角 -->
<corners android:radius="5dp" />

<!-- 间隔  -->
<padding
    android:bottom="10dp"
    android:left="10dp"
    android:right="10dp"
    android:top="10dp" />

Let me explain here that the dash parameter is set in the stroke, making the edge of the graph a dotted line.

Add a selector button.xml file under the drawable folder, the content is as follows:

<?xml version="1.0" encoding="utf-8"?>

<item android:drawable="@drawable/button_pressed_bg" android:state_pressed="true"></item>
<item android:drawable="@drawable/button_bg"></item>

The meaning of this file has been mentioned before, button_bg is displayed under normal (normal) conditions, and button_pressed_bg is displayed under press (pressed) conditions.

Let's take a look at the content of activity_main.xml in the layout directory:

<Button
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:background="@drawable/button"
    android:text="TestShapeButton" />

Directly specify the background as button.xml under the drawable folder.

The screenshot of the program running is as follows:

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